have two weeks' vacation为什么在two前不加a?

选择填空：I have _____holiday.A.two-weeks B.a two-weekC.two weeks D.a two-weeks. When have you bought the book?Two weeks ago.I have bought it for two weeks. have two weeks' vacation为什么在two前不加a? We have computer lessons ()A.once two weeks B.twice two weeks C.once every two weeksD.twice every weeks two weeks two weeks another还是another two weeks?they have to stay there for _____?为什么? The Green's family will have two-weeks holiday in Chian.为什么是 two-weeks 而不是two-weekThe Green's family will have two-weeks holiday in Chian.为什么是 two-weeks 而不是two-week? I have a ______ holiday .选词填空1.two-weeks 2.a two-week 3.two weeks 4.a two-weeks They said they would have _____ holiday.A...a two-week B...two weeks C...two-weeks Lin Tao ____(have)a party in two weeks We will have the _________(finally) exam in two weeks My parents have stayed in beijing for two weeks.But they will stay there for a_____ two weeks we 'll be awayfor two weeks because we 'll have atwo week's holiday two weeks‘ holiday We shall have our school sports meet in two weeks in two weeks的划线提问/yao zhun que They 're going to have--------holiday next montha.a two weeks b.two-week c.a two-week d.two weeks We'll be away for two weeks because we'll have a__ 填 two-week holiday还是 two week或two weeks' hol i have had the book for two weeks= __ ___two weeks __ i ____ the book.two weeks _ _ _ i _ the boo we'll be away for two weeks becaude we'll have a( ) A.two-weeks holiday B.two week's holidays C.twe'll be away for two weeks becaude we'll have a( )A.two-weeks holiday B.two week's holidaysC.two-week holiday D.two-weeks' holidays